In $G_{1}$-phase of cell cycle,what would be the change in $DNA$ content of the cell?

Which important metabolic process occurs during the interphase between two successive cell divisions?

Identify the correct statement with regard to $G_{1}$ phase $(Gap\,1)$ of interphase.

Select the correct statements regarding $S$-phase of interphase:
$I.$ Occurs between $G_{1}$ and $G_{2}$ phases.
$II.$ $DNA$ replication begins in the nucleus.
$III.$ Centrioles duplicate in the cytoplasm.
$IV.$ As $DNA$ is doubled,the number of chromosomes also doubles.
The option with correct statements is:

What is the period between two successive cell divisions called?

What happens during the $S$ phase of the cell cycle?